Anti-cavitation blade with jet flow and wall surface rolling structure

Abstract

The invention discloses an anti-cavitation blade with a jet flow and wall surface rolling structure. The anti-cavitation blade comprises a airfoil profile body, an active jet flow cavity concaved into the airfoil profile body from a suction surface is formed in the airfoil profile body in the length extending direction, and an opening, located in the suction surface, of the active jet flow cavity is a jet flow outlet. A jet flow inlet penetrating through one side wing end of the airfoil profile body is formed in the active jet flow cavity in the extension direction, and the jet flow inlet communicates with an active jet flow source; a rectifying pin which is located between the jet flow inlet and the jet flow outlet and used for prolonging the fluid flowing path is arranged in the active jet flow cavity in a protruding mode, and the overflowing area in the active jet flow cavity is gradually reduced in the fluid flowing direction. The area of the vortex area on the upstream of the jet flow outlet is reduced, the vortex area on the downstream of the jet flow outlet moves downwards, the flow separation capacity of the airfoil suction surface is restrained, the separation point is closer to the trailing edge of the airfoil, compared with a common active jet flow structure, the active jet flow structure has a larger negative pressure area, the cavitation erosion phenomenon is prevented, and the lift coefficient of the airfoil profile is obviously improved.

Description

technical field [0001] The invention relates to the field of fluid machinery, in particular to an anti-cavitation blade with a jet flow and wall surface rolling structure. Background technique [0002] The airfoil is the basic structure in the field of fluid machinery, and has been widely used in the fields of airfoils, propeller airfoils, wind power blade cross-section airfoils, and tidal energy power blade airfoils in the aviation field. With the rapid development of science and technology and fluid machinery industry, especially with the expansion of application fields, such as tidal power generation, marine water jet propulsion, underwater vehicles and other hydraulic machinery widely used, people are no longer satisfied with the traditional The dynamic performance provided by the wing puts higher and higher requirements on the performance of the airfoil. As the density and viscosity of the fluid medium change, resulting in the change of Reynolds number and Strouhal num...

AI Technical Summary

Problems solved by technology

Although the existing active jet technology can achieve a certain optimization effect, due to the relatively simple structure of the current active jet port, there is only a single jet channel, so the uniformity of the fluid injected from the jet port is poor, which affects the airfoil. The lift-drag and flow characteristics optimization effect is not good; in addition, when the fluid flows around the hydrofoil, affected by the density and viscosity of the fluid medium and the hydrofoil wall surface, the momentum loss will occur on the suction surface of the airfoil, resulting in flow separation. When the fluid flows further, a vortex will appear, forming a local low-pressure area. When the pressure in the local low-pressure area is lower than the gasification pressure of the local fluid at this temperature, cavitation will occur. Cavitation is one of the important reasons that endanger the safe operation of hydraulic machinery. , so it is urgent to solve

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